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HtmlSanitizer error with DNNSharp Action Form

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Johnhols

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2/4/2026 12:17 PM

After upgrade to 10.2.1 , i'm getting the following error when submitting a DNNSharp Action form

Could not load type 'Ganss.XSS.HtmlSanitizer' from assembly 'HtmlSanitizer, Version=9.0.0.0, Culture=neutral, PublicKeyToken=61c49a1a9e79cc28

Is this an DNNSharp problem or a DNN problem

Daniel Valadas

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MVP

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2/4/2026 1:19 PM

DNNSharp might have been using HtmlSanitizer before DNN started and their may be a version conflict. You would have to check which version is in the bin folder and in the web(dot)config "binding redirect" and in the database "Assemblies" table to get a better idea on how that conflict needs to be resolved.

Johnhols

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2/5/2026 4:40 AM

HtmlSanitizer.dll in bin folder is 9.1.878.0

There is another htmlsanitizer.dll in bin/plantanapp which is version 6.0.441.0

Where do i look for 'database "Assemblies" table '

Johnhols

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2/5/2026 4:41 AM

This got trimmed from above:-

assemblyIdentity name="HtmlSanitizer" publicKeyToken="61c49a1a9e79cc28"
bindingRedirect oldVersion="0.0.0.0-32767.32767.32767.32767" newVersion="9.0.0.0"

Johnhols

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2/5/2026 11:09 AM

In order to support the two versions of htmlsanitizer (DNN has started to use) and the older version ActionForm uses, web-config needs to be changed

dependentAssembly xmlns="urn:schemas-microsoft-com:asm.v1"
assemblyIdentity name="HtmlSanitizer" publicKeyToken="61c49a1a9e79cc28"
bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0"
bindingRedirect oldVersion="6.1.0.0-32767.32767.32767.32767" newVersion="9.0.0.0"
codeBase version="6.0.0.0" href="bin\PlantAnApp\HtmlSanitizer.dll"
codeBase version="9.0.0.0" href="bin\HtmlSanitizer.dll"
dependentAssembly

This assumes that the Actionform version is in bin\PlantanApp folder and its version is 6.0

Daniel Valadas

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MVP

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2/5/2026 12:46 PM

The above workaround would work since it is in a different folder. However I would probably contact the module vendor to make them aware of the situation, it is a pretty big version gap and a moderate security issue has been reported on all versions but the latest from HtmlSanitizer. After analysis, the issue is not exposed by DNN usage of it, but I don't know on their usage, it is something they probably want to at least analyze and potentially bump.

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